I stepped upon my soapbox to explain that it's common for little kids to get wrapped up in cooties and boys-this and girls-that but that it doesn't make any sense. I pointed out that my best friend is a boy and that my "bridesmaids" will actually be three males and two females.
Later in the day, when Eridani asked me how long my wedding dress is, I pointed to mid-shin. Olivia said, "Oh, that's short for a wedding dress. They are usually way long." I reminded her that I only paid $15 for my dress and Eridani added, "Yeah, it's different. But it's way better to spend $15 instead of $2000."
It feels good to be able to say to little kids, "There's a different way." Not force-feeding them ideas about what they have to do or what is right. Just letting them know that "normal" isn't the same as "average."